Prasanta K. Misra

Theory of the spin EPR Shift in Diluted Magnetic Semiconductors

The electron paramagnetic resonance (EPR) shift is a measure of the internal field created at the magnetic ion site in magnetic materials or materials with magnetic impurities by the partial polarization of electrons and/or carriers in an applied magnetic field. It constitutes an important study involving carriers and their interactions with the magnetic ions in an electronic system. In addition, it provides important information regarding the wave functions of the carriers as well as the Fermi surface characteristics of the system. We have derived a theory for the spin‐contribution to the EPR shift (Ps) for an electronic system in the presence of a periodic potential, spin‐orbit (SO) interaction, conduction electron‐local moment interaction, and an applied magnetic field by using an effective equation of motion of the Green’s function in a representation defined by the periodic part of the Bloch function. The spin‐EPR shift is expressed as a function of the matrix elements of the momentum, Pauli spin‐ope...